挑战习题
1/5单选题
难度:

1.

小明和小刚从相距25.2千米的两地同时相向而行,小明每小时走4千米,3小时后两人相遇,设小刚的速度为x千米/时,列方程得(  )


A

4+3x=25.2

B

3×4+x=25.2

C

3(4+x)=25.2

D

3(x-4)=25.2

提示1:
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正确答案:Qw==
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